Seismic imaging of the 2001 Bhuj Mw7.7 earthquake source zone: b-value, fractal dimension and seismic velocity tomography studies

► 3-D distributions of b- and D2 values are mapped in the 2001 Bhuj earthquake zone. ► A zone of high b, D2 and Vp/Vs values is delineated in the main rupture zone (MRZ). ► Events in the GF (D2=1.2b) zone show a poor agreement with the D=2b relationship. ► Events in the MRZ (D2=1.7b) show a fair agreement with the D=2b relationship. ► While events in the remaining parts of NWF (D2=1.95b) show a strong correlation.